I know you've told us how to fix it if the phone does not work, however every single time I try to call 3312 for a doppelganger it does not work even after trying to fix it the way it's been stated, what can I do because I'd really like to fully play this game.
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Check if you need to update your drivers, this bug seems to be something related to the pc itself because itsn't happen to everybody, it's just happening to a few of you.
If that doesn't work, so it seems that the game won't work properly on your pc, I'm sorry :c you can request a refund here: https://itch.io/support